Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands					1 Months Ended				3 Months Ended			9 Months Ended		98 Months Ended	108 Months Ended
		Jul. 31, 2022	Jul. 06, 2022	Dec. 04, 2019	Jul. 31, 2022	Jun. 30, 2022	May 31, 2022	Apr. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Aug. 31, 2020	Sep. 30, 2021
Subsequent Event [Line Items]
Loan repayment												$ 14,615,000	$ 9,750,000
Term Loan
Subsequent Event [Line Items]
Loan repayment												95,900,000
Revolving Credit Facility
Subsequent Event [Line Items]
Loan repayment												$ 69,100,000
Sixth Amendment
Subsequent Event [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility				$ 400,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility				550,000,000
Sixth Amendment | Term Loan
Subsequent Event [Line Items]
Outstanding term loan				$ 165,000,000
Senior secured term loan maturity period				5 years
Repurchase Plan
Subsequent Event [Line Items]
Company's common units repurchased and retired						198	124	165	487	992	1,104			14,400	21,979
Average price paid per unit	[1]					$ 10.00	$ 10.59	$ 11.10	$ 10.52	$ 10.50	$ 10.65				$ 8.60
Subsequent Event | Credit Agreement
Subsequent Event [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility			$ 400,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility			550,000
Issuance of line of credit for working capital purposes			$ 25,000,000
Senior secured term loan maturity date			Jul. 06, 2027
Subsequent Event | Credit Agreement | Term Loan
Subsequent Event [Line Items]
Outstanding term loan			$ 165,000,000
Senior secured term loan maturity period			5 years
Loan repayment			$ 95,900,000
Subsequent Event | Credit Agreement | Revolving Credit Facility
Subsequent Event [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility			400,000,000
Maximum borrowing capacity (heating season December to April) under revolving credit facility			550,000,000
Loan repayment			69,100,000
Subsequent Event | Sixth Amendment
Subsequent Event [Line Items]
Non Seasonal maximum borrowing capacity under revolving credit facility			400,000,000
Availability required to repurchase common units			$ 60,000,000
Percentage of the maximum facility size on a historical proforma and forward-looking basis			15.00%
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units			115.00%
Subsequent Event | Repurchase Plan
Subsequent Event [Line Items]
Company's common units repurchased and retired					126
Average price paid per unit	[1]				$ 9.73
Subsequent Event | Dividend Declared
Subsequent Event [Line Items]
Distribution declared		$ 0.1525			0.1525
Partners capital projected distribution amount on annualized basis		0.61			$ 0.61
Minimum dividend distribution per unit		$ 0.0675
Amount to paid to common unit holders		$ 5,500,000
Amount to paid to the General Partner		300,000
Incentive distribution to the General Partner		300,000
Incentive distributions to management		$ 300,000
Dividend paid date		Aug. 02, 2022
Dividend record date		Jul. 25, 2022

[1] Amount includes repurchase costs.